diff options
| author | Tom Lane | 2018-05-02 22:06:43 +0000 |
|---|---|---|
| committer | Tom Lane | 2018-05-02 22:06:43 +0000 |
| commit | 1c72ec6f498945eb5981cdedd448aec3977477c8 (patch) | |
| tree | 581be6b9afa1d1f13d663f0d4030e6f2e7c0f96e /configure.in | |
| parent | 40f52b16dd31aa9ddc3bd42daa78459562693567 (diff) | |
Improve our method for probing the availability of ARM CRC instructions.
Instead of depending on glibc's getauxval() function, just try to execute
the CRC code, and trap SIGILL if that happens.
Thomas Munro
Discussion: https://postgr.es/m/HE1PR0801MB1323D171938EABC04FFE7FA9E3110@HE1PR0801MB1323.eurprd08.prod.outlook.com
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 21 |
1 files changed, 2 insertions, 19 deletions
diff --git a/configure.in b/configure.in index da02a56ec66..c3841d5b07f 100644 --- a/configure.in +++ b/configure.in @@ -2014,22 +2014,6 @@ if test x"$pgac_armv8_crc32c_intrinsics" != x"yes"; then fi AC_SUBST(CFLAGS_ARMV8_CRC32C) -# In order to detect at runtime, if the ARM CRC Extension is available, -# we will do "getauxval(AT_HWCAP) & HWCAP_CRC32". Check if we have -# everything we need for that. -AC_CHECK_FUNCS([getauxval]) -AC_COMPILE_IFELSE([AC_LANG_PROGRAM([ -#include <sys/auxv.h> -#include <asm/hwcap.h> -], [ -#ifndef AT_HWCAP -#error AT_HWCAP not defined -#endif -#ifndef HWCAP_CRC32 -#error HWCAP_CRC32 not defined -#endif -])], [HAVE_HWCAP_CRC32=1]) - # Select CRC-32C implementation. # # If we are targeting a processor that has Intel SSE 4.2 instructions, we can @@ -2060,9 +2044,8 @@ if test x"$USE_SLICING_BY_8_CRC32C" = x"" && test x"$USE_SSE42_CRC32C" = x"" && if test x"$pgac_armv8_crc32c_intrinsics" = x"yes" && test x"$CFLAGS_ARMV8_CRC32C" = x""; then USE_ARMV8_CRC32C=1 else - # ARM CRC Extension, with runtime check? The getauxval() function and - # HWCAP_CRC32 are needed for the runtime check. - if test x"$pgac_armv8_crc32c_intrinsics" = x"yes" && test x"$ac_cv_func_getauxval" = x"yes" && test x"$HAVE_HWCAP_CRC32" = x"1"; then + # ARM CRC Extension, with runtime check? + if test x"$pgac_armv8_crc32c_intrinsics" = x"yes"; then USE_ARMV8_CRC32C_WITH_RUNTIME_CHECK=1 else # fall back to slicing-by-8 algorithm, which doesn't require any |